A quick tutorial on how to remotely control a regular computer PWM fan with Home assistant and an ESP32 MicroController.

Components:
ESP32: https://amzn.to/3uiLMC4
USB Power Adapter: https://amzn.to/46hdAE9
PWM Fan: https://amzn.to/46663bq
Breadboard: https://amzn.to/3METMUm
Jumper Wires: https://amzn.to/46fO1Dw
DC Connector: https://amzn.to/3MGCciG
(As an Amazon Associate, I earn from qualifying purchases)

CODE:
sensor:
platform: pulse_counter
pin: GPIO13
name: PWM Fan RPM
id: fan_pulse
unit_of_measurement: 'RPM'
filters:
multiply: 0.5
count_mode:
rising_edge: INCREMENT
falling_edge: DISABLE
update_interval: 3s

output:
platform: ledc
pin: GPIO12
frequency: 10000 Hz
id: fanhub_pwm

fan:
platform: speed
output: fanhub_pwm
name: "PWM Fan"

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00:00 Intro
00:17 Components
01:01 Need to know
01:24 Plug In ESP32
02:46 Edit Code
03:46 Wire 12v Power
04:32 3rd Pin Tach
05:02 4th Pin PWM
05:19 ESP32 Power
05:53 PreFlight Check
06:39 Plug In and control
07:42 Can add more sensors